Tool-holder.



P. B. E. MARBLE da A. HAMMAR.

` Toor. HOLDER.

APPLICATION FILED JUNE 27, 1907.

Patented Dec. 8, 1908.

UNITED sTATEs PATENT oEEioE.

FREDERICK E. E. MARBLE AND CARL A. HAMMAR, OF WORCESTER, MASSACHUSETTS.

TOOL-HOLDER.

Specification of Letters Patent.

Application led June 27, 1907.

Patented Dec. 8, 1908.

Serial No. 381,052.

To all whom it may concern.'

Be it known that we, FREDERICK E. E. MARBLE and CARL A. HAMMAR, citizensof the United States, residing at Worcester, in the county of Wvorcesterand State of Massachusetts, have invented a new and useful Tool-Holder,of which the following is a specification.

This invention relates to a tool holder which is especiallv adapted foruse to hold drills for metal wor ring purposes, but is capable ofgeneral use.

The principal objects of the invention are to provide means whereb atool holder of this kind which is capab e of being set to drill at anangle, can be provided with means for feeding the tool as the shaftrotates, which means may readily be thrown out of operative connectionso that the tool may be fed by hand or operated without feeding, as maybe desired.

Another object of the invention is to conneet the feeding means withmeans for adjusting the angular position of the shaft in such a way thatthe bearing for the shaft may provide means for guiding the tool as itis fed.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accom anying drawings which illustrate apre erred form of the invention and in which,

Figure 1 is a side elevation of said preferred form showing the use ofthe same for drilling at an angle and feeding the drill forward as itrotates, showing in dotted lines another position of the parts, and Fig.2 is an elevation at right angles to Fig. 1.

The drawings show a shaft 10 which is adapted to be placed in a chuck ofan ordinary drilling machine n the usual manner. On this is mounted abearing 11 which is provided with a segmental arm 12. This shaft isconnected by a double Hookes joint or other flexible connection 13 witha shaft 14 mounted in a bearing 15 which has a segmental arm 16 thereonprovided with a curved slot 17. The Hooke s joint is made u of a seriesof links connected preferably by fil ister head screws 18 so that thetwo shafts may be mounted at an desired angle to each other and motionwi l be transmitted from one to the other in a comparativelyfrictionless manner. In order to hold these shafts at any desired angle,a bolt 19 is passed through the slot 17 and mounted on the end of thearm 12 and this isV provided with a thumb screw 20 by the tightening ofwhich the two shafts may be held at any desired angle.

In order to provide for feeding the tool forward with the rotationthereof, the shaft 14 is provided with a worm 21 and is made hollow.Within the shaft 14 is mounted a second shaft 22 having a key way 23engaging a key or projection within the shaft 14, not shown, so as toguide the shaft 22 to move longitudinally and to cause the same torotate with said shaft 14 and worm.

Preferably connected with the bearing 15 is an arm 25 which is providedwith a slot through which asses a screw 27 mounted on a frame 30. T 'sframe is provided with a tubular guide 31 surrounding the worm and this,together with the longitudinal slot in the arm 25 serves to guide theframe longitudinally: The frame is also provided with a bearing 32through which the shaft 22 passes, the same being rovided with collars33 on either side of the earing fixed to the shaft so that the framewill move with the shaft.

On the frame is mounted a screw-threaded stud 34 on which is looselymounted to rotate a worm wheel 35 with friction disks 36 on both sidesof the same. A casing 37 is mounted on the stud having projections 38extending through perforations in the frame to hold it in osition. Athumb nut 39 is mounted on t e outside of the casing and is adapted tobe turned up to press the friction disks closely against the worm wheelto hold the same from rotating. When this is done, the rotation of theworm 21 with which the worm wheel meshes, serves to feed the fixed wormwheel together with the frame and the shaft 22 longitudinally so thatthe tool 42 which is mounted in a chuck 43 or the like on the shaft 22will be fed regularly with the rotation of the shaft. The slot in thearm 25 limits the feeding motion and at the same time serves to guidethe frame together with the bearings 31 and 32.

When it is desired to operate without automatic feed, the thumb screw 39is loosened and the handle 44 on the frame may be used to ad`ust theframe. lf desired, the screw 27 may e tightened up so as to hold theframe at any desired point in its traverse.

It will be seen, therefore, that the device may be adjusted by hand towork at any desired distance, within the limits of its capacity, fromthe center of the main shaft, and that it can be adjusted in a verysimple and -convenient manner to feed automatically;

respect to the bearings on the main shaft, theV frame is caused to moveabsolutely in alinement with the shaft.

While we have illustrated and described a preferred embodiment of theinvention, We are aware that many modifications may be made thereinwithout departing from the scope of the invention as expressed in theclaims.

Therefore, we do not Wish to be limited to the particular form shown,but what we do claim is l. In a tool-holder, the combination with twoshafts, flexible means for connecting them together, a segmental armconnected with one of said shafts, means adapted to be secured at anypoint along said arm for holding the other of said shafts at any desiredangle thereto, and means for feeding a tool supported by said arm andcomprising a worm-wheel, of means for fixing said wormwheel to preventthe rotation thereof, means for connecting the worm-wheel with a toolchuck splined to one of said shafts, and a worm on the last named shaftmeshing with said worm-wheel.

2. In a tool-holder, the combination of a hollow Ishaft having a wormthereon, a shaft inside said hollow shaft having means whereby it willbe rotated by s aid hollow shaft, said second shaft being slidable inthe hollow shaft, a frame connected with the second shaft, and aworm-wheel mounted on said frame and meshing with said worm.

3. In a tool-holder, the combination with a hollow shaft, an inner shaftmounted to slide with respect to the hollow shaft and to turn therewith7said inner shaft being adapted to support a tool chuck or the like, aframe connected with said inner shaft to slide therewith, and means onthe hollow shaft for feeding said frame and inner shaft as the hollowshaft is rotated. l

4. In a tool-holder, the combination with a hollow shaft, an inner shaftmounted to slide with respect to the hollow shaft and to turn therewith,said inner shaft being adapted to support a tool chuck or the like, aframe connected with said inner shaft to slide therewith, and meansconnected with said frame and hollow shaft for feeding said frame andinner shaft as the hollow shaft is rotated, which readily can be thrownout of coperative relation with said hollow shaft to avoid the feedingof the inner shaft.

5. The combination of a hollow shaft, an inner shaft mounted to slidewith respect to the hollow shaft and to turn therewith, a non-rotatableframe connected with the inner pivoted on an axis transverse of thedirection of movement thereof, a friction disk connected with the frameand engaging said wheel, means for tightening and loosening the diskwith respect to the wheel and means engaging the wheel at its peripheryconstructed and adapted to convert the rotary moti-on of the hollowshaft into sliding motion of the frame when the disk is tight or rotarymotion of the wheel when the disk is loose.

6. A tool-holder, comprising a rotatable member having a worm thereon, aslidable member adapted to turn with the rotatable member, a worm wheelmeshing with the worm and connected with the slidable member to slidetherewith, and means for xing the worm-wheel with respect to theslidable member to prevent the worm-wheel from rotating, said slidablemember being rotatable independently of said Worm-wheel and of saidfixing means. v

7. A tool-holder comprising a rotatabl member having a worm thereon, aslidable member adapted to turn with the rotatable member, a worm-wheelmeshing with the worm and connected with the slidable member, means forfixing the worm-wheel to the slidable member to prevent it fromrotating, a bearing for said rotatable member, and a guide for theslidable member fixed to said bearing.

8. A tool-holder comprising a bearing, a rotatable member passingthrough said bearing and having a worm thereon, a slidable memberadapted to rotate with the rotatable member, a frame constituting a partof said slidable member constructed and arranged to slide therewith,said slidable member being rotatable independently of said frame, aworm-wheel on said frame meshing with said worm, a friction disk mountedon said worm-wheel and casing, means for tightening said friction diskagainst the wormwheel to prevent its rotation, and a guide mounted onsaid bearing for said frame.

9. A tool-holder comprising a rotatable member, a slidable membersupported thereby, and having means cooperating with the rotatablemember for transmitting a motion of rotation from the rotatable memberto the sliding member and for permitting the sliding member to slideindependently of the rotatable member, and means comprising a slidingframe supported by said members and operatively connected with therotatable member for transmitting the motion of rotation from therotatable member to feed along the sliding member, said sliding memberhaving means for mounting a tool thereon.

10. A tool-holder comprising a rotatable member, a slidable membersupported thereby, a guide su ported by said rotatable member for the sidable member, and means shaft to slide therewith, awheel on the frame 1supported by and connected with said rotatable members for transmittinga motion of rotation from the rotatable member to the slidable memberand for permitting the slidable member to move longitudinally withrespect to the rotatable member.

11. A tool-holder comprisin a rotatable member, a bearing therefor, a sidable member comprising a frame, and having means coperatlng with therotatable member for causing the slidable member to rotate with therotatable member and ermitting it to slide with respect thereto saidframe having a tubular guide surrounding said rotatable member and saidbearing having a uide extending longitudinally of the rotatable member,and engaging the frame to guide it, a handle on the frame, and means fortransmitting motion of rotation of said rotatable member to said frameto slide the latter.

12. In a tool holder, the combination of two shafts, a flexible jointconnecting said shafts, a bearing for each shaft at the adj acent endsthereof, means for securing said shafts in adjusted angular positionscomprising a clamping device connected with one bearing, and an armrigidly mounted on the other bearing to which the clamping device may besecured, means on one of said shafts for sup orting a tool, and meansrigidly supported) by the bearin on said too supporting shaft extendingalong said toolsuplporting shaft and connected with said too supportingmeans for feeding the tool alono' said tool-supporting shaft as it isrotated by the other shaft.

In testimony whereof we have hereunto set our hands, in the presence oftwo subscribing witnesses.

FREDERICK E. E. MARBLE. CARL A. HAMMAR.

Witnesses:

ALBERT E. FAY, M. E. REGAN.

